PART NO. 769-05624 P00
(2/10)
YM70SS
2-Cycle Trimmer Operator’s Manual
SERVICE INFORMATION
TABLE OF CONTENTS
Service Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2
Rules for Safe Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2
Know Your Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3
Assembly Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3
Oil and Fuel Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3
Starting/Stopping Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3
Operating Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3
Maintenance & Repair Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
Cleaning and Storage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
Troubleshooting Chart . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
Warranty Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16
All information, illustrations, and specifications in this manual are based on the latest product information
available at the time of printing. We reserve the right to make changes at any time without notice.
Copyright© 2010 MTD SOUTHWEST INC, All Rights Reserved.
For service call
1-800-800-7310
in the United States or
1-800-668-1238
in Canada to obtain a list of authorized
service dealers near you. For more details about your unit, visit our website at
www.mtdproducts.com
or
www.mtdproducts.ca
.
If you have difficulty assembling this product or have any questions regarding the controls, operation or
maintenance of this unit, please call the Customer Support Department.
DO NOT RETURN THE UNIT TO THE RETAILER. PROOF OF PURCHASE WILL BE REQUIRED FOR
WARRANTY SERVICE.
Service on this unit both within and after the warranty period should be performed only by an authorized and
approved service dealer.
Before beginning, locate the unit’s model plate. It lists the model and serial numbers of your unit. Refer to
the sample plate below and copy the information for future reference.
Copy the serial number here:
Copy the model and parent part numbers here:
RULES FOR SAFE OPERATION
The purpose of safety symbols is to attract your attention to possible dangers. The safety symbols,
and their explanations, deserve your careful attention and understanding. The safety warnings do
not by themselves eliminate any danger. The instructions or warnings they give are not substitutes
for proper accident prevention measures.
NOTE:
Advises you of information or instructions vital to the operation or maintenance of the equipment.
SYMBOL MEANING
SPARK ARRESTOR NOTE
NOTE: For users on U.S. Forest Land and in the states of California, Maine, Oregon and Washington.
All U.S. Forest Land and the state of California (Public Resources Codes 4442 and 4443), Oregon and
Washington require, by law that certain internal combustion engines operated on forest brush and/or grass-
covered areas be equipped with a spark arrestor, maintained in effective working order, or the engine be
constructed, equipped and maintained for the prevention of fire. Check with your state or local authorities for
regulations pertaining to these requirements. Failure to follow these requirements could subject you to liability
or a fine.
This unit is factory equipped with a spark arrestor.
If it requires replacement, ask your LOCAL
SERVICE DEALER to install the
Accessory Part #753-05169 Muffler Assembly
.
READ ALL INSTRUCTIONS BEFORE OPERATING
• Read the instructions carefully. Be familiar with the controls and proper use of the unit.
• Do not operate this unit when tired, ill, or under the influence of alcohol, drugs, or medication.
• Children and teens under the age of 15 must not use the unit, except for teens guided by an adult.
• All guards and safety attachments must be installed properly before operating the unit.
• Inspect the unit before use. Replace damaged parts. Check for fuel leaks. Make sure all fasteners are in
place and secure. Replace parts that are cracked, chipped, or damaged in any way. Do not operate the
unit with loose or damaged parts.
• Carefully inspect the area before starting the unit. Remove all debris and hard or sharp objects such as
glass, wire, etc.
• Be aware of the risk of injury to the head, hands and feet.
• Clear the area of children, bystanders, and pets. At a minimum, keep all children, bystanders, and pets
outside a 50 feet (15 m) radius; there still may be a risk to bystanders from thrown objects. Bystanders
should be encouraged to wear eye protection. If approached, stop the unit immediately.
• Use only 0.095 inch (2.41 mm) diameter original equipment manufacturer replacement line. Never use
metal-reinforced line, wire or rope. These can break off and become dangerous projectiles.
• Squeeze the throttle control and check that it returns automatically to the idle position. Make all
adjustments or repairs before using unit.
SAFETY WARNINGS FOR GAS UNITS
• Store fuel only in containers specifically designed and approved for the storage of such materials.
• Avoid creating a source of ignition for spilled fuel. Do not start the engine until fuel vapors dissipate.
• Always stop the engine and allow it to cool before filling the fuel tank. Never remove the cap of the fuel
tank, or add fuel, when the engine is hot. Never operate the unit without the fuel cap securely in place.
Always loosen the fuel tank cap slowly to relieve any pressure in the tank.
• Mix and add fuel in a clean, well-ventilated outdoor area where there are no sparks or flames. Do not
smoke while fueling or mixing fuel. Wipe up any spilled fuel from the unit immediately. Always wipe unit
dry before using.
• Move the unit at least 30 feet (9.1 m) from the fueling source and site before starting the engine. Do not
smoke or allow sparks and open flames near the area while adding fuel or operating the unit.
WHILE OPERATING
• Never start or run the unit inside a closed room or building. Breathing exhaust fumes can kill. Operate this
unit only in a well ventilated outdoor area.
• Wear safety glasses or goggles that are marked as meeting ANSI Z87.1-1989 standards. Also wear
ear/hearing protection when operating this unit. Wear a face or dust mask if the operation is dusty. Long
sleeve shirts are recommended.
• Wear heavy, long pants, boots and gloves. Do not wear loose clothing, jewelry, short pants, sandals or go
barefoot. Secure hair above shoulder level.
• The cutting head shield must always be in place while operating the unit. Do not operate unit without
both trimming lines extended, and the proper line installed. Do not extend the trimming line beyond the
length of the shield.
• The cutting attachment may spin during idle speed adjustments. Wear protective clothing and observe all
safety instructions to prevent serious personal injury.
• Adjust the D-handle to provide the best grip.
• Be sure the cutting head is not in contact with anything before starting the unit.
• Use the unit only in daylight or good artificial light.
• Avoid accidental starting. Be in the starting position whenever pulling the starter rope. The operator and
unit must be in a stable position while starting. See Starting/Stopping Instructions.
• Use the right tool. Only use this tool for the purpose intended.
• Do not overreach. Always keep proper footing and balance.
• Always hold the unit with both hands when operating. Keep a firm grip on both the front and rear handle
or grips.
• Keep hands, face, and feet at a distance from all moving parts. Do not touch or try to stop the cutting
head when it is rotating.
• Do not touch the engine or muffler. These parts get extremely hot from operation. They remain hot for a
READ THE OPERATOR’S MANUAL AND FOLLOW ALL WARNINGS AND SAFETY
INSTRUCTIONS. FAILURE TO DO SO CAN RESULT IN SERIOUS INJURY TO THE OPERATOR
AND/OR BYSTANDERS.
FOR QUESTIONS, CALL 1-800-800-7310 IN U.S. OR 1-800-668-1238 IN CANADA
CALIFORNIA PROPOSITION 65 WARNING
WARNING
THE ENGINE EXHAUST FROM THIS PRODUCT CONTAINS CHEMICALS KNOWN TO THE STATE
OF CALIFORNIA TO CAUSE CANCER, BIRTH DEFECTS OR OTHER REPRODUCTIVE HARM.
SAFETY ALERT:
Indicates danger, warning or caution. Attention is required in order to
avoid serious personal injury. May be used in conjunction with other symbols or pictographs.
DANGER:
Failure to obey a safety warning will result in serious injury to yourself or to
others. Always follow the safety precautions to reduce the risk of fire, electric shock and
personal injury.
WARNING:
Failure to obey a safety warning can result in injury to yourself and others. Always
follow the safety precautions to reduce the risk of fire, electric shock and personal injury.
CAUTION:
Failure to obey a safety warning may result in property damage or personal injury
to yourself or to others. Always follow the safety precautions to reduce the risk of fire, electric
shock and personal injury.
WARNING:
When using the unit, you must follow the safety rules. Please read these
instructions before operating the unit in order to ensure the safety of the operator and any
bystanders. Please keep these instructions for later use.
WARNING:
Gasoline is highly flammable, and its vapors can explode if ignited. Take the
following precautions:
